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1. Power failure
(1) The power supply is not turned on.
Move the main power setting for
OFF→ ON.
Is the POWER/STANDBY lamp lit?
YES
(2) Flashing in green (Alarm of
temperature sensor error or fan
error) Go to (P4-3).
(3) Flashing in red (Alarm of tem-
perature error) Go to (P4-5).
(4) Reciprocal flashing in red and
green (Alarm of panel error) Go
to (P4-6).
(5) Lighting in green, and then in
red (Alarm of power line error)
Go to (P4-8).
Is a 5Vdc output available in the state
that the LD connector is disconnected
and the main power is turned ON?
YES
NO
Is a 5Vdc output available in the state
that the RS connector is disconnected
and the main power is turned ON?
YES
NO
The PW connector, PWR PWB or the
MAIN PWB is fault.
NO
The LD con-
nector or the
LED PWB is
fault.
The RS con-
nector or the
232C PWB is
fault.
(Caution) If any abnormality is sensed in such a manner that the
LED flashes or lights, all the power lines other than those
of 7Vdc (M+7V) and 5Vdc (M+5V) are automatically
turned off in about 10 seconds. When checking the power
lines other than those of M+7V and M+5V, a circuit tester
or the like should have been connected in advance.
Is the AC power output
available at the AC connec-
tor (power cord)?
YES
1
Is a 6.8Vdc output available
at Pin
of the PM connec-
tor?
YES
1
Is a 6.8Vdc output available
at Pin
of the PW connec-
tor?
NO
The PW con-
nector or the
YES
PWR PWB is
fault.
6
Is a 6.8Vdc output available
at Pin
of the PM connec-
tor?
NO
The PM con-
nector or the
MAIN PWB is
YES
fault.
3
Is a 4.9Vdc output available
at Pin
of the PM connec-
tor?
NO
YES
4
Is a 5Vdc output available
at Pin
of the PW connec-
tor?
YES
NO
The MAIN PWB is fault.
3-2
NO
The power cord is defective.
NO
Is a 6.8Vdc output available in
the state that the LD connec-
tor is disconnected and the
main power is turned ON?
The LD con-
YES
nector or the
LED PWB is
fault.
NO
Is a 6.8Vdc output available in
the state that the PW connec-
tor is disconnected and the
main power is turned ON?
YES
The PW con-
nector or the
PWR PWB is
NO
fault.
Is a 6.8Vdc output available in
the state that the PM connec-
tor is disconnected and the
main power is turned ON?
YES
The PM con-
nector or the
MAIN PWB is
fault.
NO
The power unit is fault.
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